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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need a refresher on load development.
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<blockquote data-quote="RBrowning" data-source="post: 24965" data-attributes="member: 412"><p>The premise of the ladder method is that you will find areas in your incremental loading progression that have clumps of holes and areas that have few holes. This is caused by a combination of the bullet velocity and the amplitude of the vibration. If it was velocity only you would have a vertical string of evenly spaced holes. But because the two interact you get groups of three or four as shown in the graph above. If you load in the center of these groups it makes the load less sensitive to powder measure and case capacity variations.</p><p></p><p>If I remember the article correctly the powder increment is not necessarialy a fixed amount, but it is the range of measure that you want to test divided by 15. If your manual reccommends loading your favirite cartridge with somewhere between 68 to 73 grains of powder, you would take the 5 grain range and divide it by 15 to get an increment of .33 grains. If the math is easier or the weight increments are awkward, you can use more steps than 15. This will make the groups even easier to see. If you go to fewer increments you might not see a group where there really is one.</p><p></p><p>[ 01-17-2003: Message edited by: RBrowning ]</p></blockquote><p></p>
[QUOTE="RBrowning, post: 24965, member: 412"] The premise of the ladder method is that you will find areas in your incremental loading progression that have clumps of holes and areas that have few holes. This is caused by a combination of the bullet velocity and the amplitude of the vibration. If it was velocity only you would have a vertical string of evenly spaced holes. But because the two interact you get groups of three or four as shown in the graph above. If you load in the center of these groups it makes the load less sensitive to powder measure and case capacity variations. If I remember the article correctly the powder increment is not necessarialy a fixed amount, but it is the range of measure that you want to test divided by 15. If your manual reccommends loading your favirite cartridge with somewhere between 68 to 73 grains of powder, you would take the 5 grain range and divide it by 15 to get an increment of .33 grains. If the math is easier or the weight increments are awkward, you can use more steps than 15. This will make the groups even easier to see. If you go to fewer increments you might not see a group where there really is one. [ 01-17-2003: Message edited by: RBrowning ] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need a refresher on load development.
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